<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Welcome to Blog Subdomain</title>
</head>
<body>
<h1>Hello, World!</h1>
<p>This is the blog subdomain.</p>
</body>
</html>
If you want your subdomain to be served over HTTPS, you need to install an SSL certificate. You can obtain a free SSL certificate from Let’s Encrypt.